Lipoprotein(a): The Inherited Heart Risk Most People Never Test
Lp(a) is a largely genetic, especially atherogenic particle that raises heart risk — and nearly everyone should measure it once. Here's what your level means.
Manifold Health Clinical Team
Medically reviewed clinical content
Table of contents
Share
A high lipoprotein(a) — or Lp(a) — means you've inherited a higher-than-average number of an especially artery-damaging cholesterol particle, and it's one of the most important heart-risk markers that standard cholesterol panels leave out.
Lp(a) is an LDL-like particle with an extra protein attached that makes it more prone to driving plaque and clots. Your level is roughly 80–90% genetically determined and stays fairly stable for life — which is exactly why measuring it once is so valuable. This is educational content, not medical advice.
The short version
Lp(a) is largely genetic and mostly set for life — you measure it once.
General thresholds: below ~75 nmol/L (30 mg/dL) low, above ~125 nmol/L (50 mg/dL) high, with a gray zone between.
High Lp(a) is associated with roughly a 50–60% higher risk of atherosclerotic cardiovascular disease.
Major guidelines (2024 National Lipid Association, European and Canadian societies) recommend testing every adult once.
There's no approved drug that lowers Lp(a) for outcomes yet, so management focuses on controlling every other risk factor aggressively.
What counts as high
Lp(a) is usually reported in nmol/L (preferred) or mg/dL. Broadly: below 75 nmol/L (~30 mg/dL) is lower risk, 75–125 nmol/L (30–50 mg/dL) is a borderline gray zone, and 125 nmol/L (~50 mg/dL) and above marks meaningfully elevated risk. The higher the level, the greater the risk.
Why it matters — and why once is enough
Because Lp(a) is inherited and stable, a single lifetime test tells you your baseline. It's especially important if you have a family history of early heart disease, personal cardiovascular disease, or an LDL that stays stubbornly high. High Lp(a) helps explain heart attacks that occur despite otherwise "normal" cholesterol.
What you can do about a high Lp(a)
Since there's no approved therapy that lowers Lp(a) and improves outcomes yet (several are in trials), the strategy is to shrink your total risk: aggressively manage LDL and ApoB, blood pressure, blood sugar, and lifestyle, and not smoke. A clinician may treat other lipids more intensively when Lp(a) is high.
Which provider and what to ask
Primary care, cardiology, and preventive/lipid specialists handle this. Ask: Should I measure Lp(a) once? Given my level and family history, how aggressively should we manage my other risk factors? Should my first-degree relatives be tested?
Frequently asked questions
Do I need to fast for an Lp(a) test?
No. Lp(a) is stable and doesn't require fasting.
Can I lower Lp(a) with diet or exercise?
Lifestyle has little effect on Lp(a) itself — but it powerfully lowers your overall cardiovascular risk, which is the goal.
Should my family be tested?
Often yes, because it's inherited. Discuss with your clinician.
Why isn't Lp(a) on a standard panel?
Historically it wasn't routinely ordered, though that's changing as guidelines now recommend universal one-time testing.
Key takeaways
Lp(a) is a mostly-genetic, especially atherogenic particle — measure it once.
Above ~125 nmol/L (50 mg/dL) marks meaningfully higher heart risk.
Management centers on aggressively controlling every other risk factor.
Know your inherited heart risk
Sidewalk can help you understand advanced lipid results and connect with a provider who takes Lp(a) seriously. Complete a free AI health assessment or find a provider.
This article is for educational purposes only and is not a substitute for professional medical advice.
